On 02/09/14 19:38, Alexandre DERUMIER wrote:
Hi Sebastien,
I got 6340 IOPS on a single OSD SSD. (journal and data on the same partition).
Shouldn't it better to have 2 partitions, 1 for journal and 1 for datas ?
(I'm thinking about filesystem write syncs)
Oddly enough, it does not seem to make much difference. I'm seeing
approx 8000 IOPS [1] with configs:
- journal and data on same partition
- journal on one partition, data on another
- journal on one partition of one disk (file not device), data on
another partition on another disk
I think we are just running into the next software bottleneck - our
devices are fast enough to *not* be the limiting factor!
Cheers
Mark
[1] I'm seeing a higher IOPS number from Sebastien's, possibly as my ssd
are faster for short lived benchmarks, or for some other hardware based
reason (single socket i7 + memory timings a bit better for simple
workloads etc), but the basic finding is the same I think.
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